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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9474437b06671a29157c9a297bb21271fc0507305b85c02b72b436f8b99899a4' 
  AND token = 'D5SnmzqgLp88J7BEX5vM08K+DH6lF7S1AWyt28iIsF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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