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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee564f9f27167ae673b15a22536f06c0985368388e43a1ac542189f075f09d84' 
  AND token = 'LFVTx78fOnJUwari3PDGPUhbKsvqW6Ft3HyxijyEy2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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