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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bcd817398c741a8c559f533e04de7bbe6e100f0d107cc1fb3f1d5c83880039' 
  AND token = '9ptSxMEVKO8QxjufZJXsURseHjw7BehI8KSErI8GbOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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