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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7c99d66dbf950d6513dc532d5583095e875334a9d29c8a8ffb8776a3d4d042' 
  AND token = 'pNigQP2X0SCA1n1da6MHeXe2YGL1FWtMIeYVOLhZgGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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