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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d41019a68dd7476e636ca30e2c504e17a8245523d96f4e72380ab56b81ab4c' 
  AND token = 'X5WKdMtD4WS0xHNhNI719bfnQmh9w3TME0fuIfB/BoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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