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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01935147bafba54d3350f09c72723e942ba479509dcbadd2d943925f10d2122a' 
  AND token = 'YKaui0hr4ozUU9kI2Yysg580d8iRFYgLg7Kp0e3PqsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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