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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da9eb4e565b1bfd4815371821f12c70139f12f016c218acfc6a3c873b0f2c13' 
  AND token = '1TsCXHmq6Tf0M6Z5UeDf9IXq0rLqiuOe8Os26cRfCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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