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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940fd13c19dd415c5994e094dfdbf8913e9b13cac04317dcbd177e3ebdffd32' 
  AND token = 'Wd5ojciHOTG0cJTplquqxyUgetLJkOaEM4C1uyFvGJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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