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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e30556611d9eab53e7ee43c827d050d94b190e0b71fe62b9b2d094c6f696ba9' 
  AND token = 'TxYU+dskliO0oqflbe/V/VYRh0/lgML+U88kgr7Vx5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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