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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ecec512663f22e2083a9438c04d67584ee0ccf9747f925efb4ef7654e7ee17' 
  AND token = 'H6HxB9bcTcKwjiOELX7snNkBnIt56KXXO1/ezAl52+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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