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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfda4850316a7ff1c3acb0bf8c459312131ba6e58948ed528e643e43e7e3b31' 
  AND token = 'D5cpM3MgK5PIfiSCEB6CkyG3FfkWRZkxKWYd6yBdrX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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