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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee0b823769436e006a072129bd38020947cbdf6d34a8134141caf7941c5088c' 
  AND token = 'gN8r61y2KHnKeGJnyTqHOEr7v0alf2/V1eD27LpFVJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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