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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198bea5dcc3fdcaa38b28a185a1cb6da780716bf9fdff11a0b2d14d041552919' 
  AND token = 'korhdUb586+A7a+DMnmAKhGPxQVQe+jRt3X9J5ZhSv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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