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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa58a39a4b32b1e8e13e2ce1c6ad7dc71eb778ab4a3993dd03acb91cb84d7f51' 
  AND token = 'f55m0TccAwN2y8RkTEu/PlvbUaJtMIZkv83/9rFfFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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