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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93b7321c6f87acd3a93d91942d5ee1b3f7c0da46026f1452785a62c4dda3013' 
  AND token = 'w5QVBJda92Rjp4brboMNLHQt7N4qS0FNE2SRBTHwZF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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