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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86d8205b981058682a95d6cf37dddd663abf14ccb7ff4bf5d5285e88c26285f' 
  AND token = '91o4a4jIEwBVxW5NhkLJbzMNg0NnR1Iwh2XAnelM/U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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