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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa09c56ea7c6e3139e0cd9f026dca679db57839063c9eec6be13f1524904e279' 
  AND token = 'OcVyoDbjigmjQ+BCtfeP6BwPnMm2/3ClXTHpFVjgh4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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