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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a83d866e24fe35af7a39f2dc6813c5552ee7aaed6b1b4e72e237bf2f28dc975' 
  AND token = 'a8lETpP9c5/xOyU3Lv8iw+iV795EFYPzv1jDMhlWdpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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