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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b8860f7925e4bd0ae04a0487d970a70e34d94e8e83e61bfd1717a7601ace7d' 
  AND token = 'wYwzyJ9NJjsMGBspsfpMh2qiYuivOCSNXjGHVINjeOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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