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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf536c1663c435c3dc7c12c39ec2850e3a6eb1e959de0b5d3c11eee3af7e1712' 
  AND token = 'UbzsTYjO+YtsIBZiqCZepp/v9dsbGzg0yV36msls1CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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