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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9982bdd432b3891c72d31e5b0b91586aa36bf04398b31aa40266050ca8da08bb' 
  AND token = '/KofnUTTlj5twv06nQqG3XMtC5FDJlU+j5Dd3AU853M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}