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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be77bb7eeeeafb5b43a1182a9b80158a11f2811b7070c298bc06967b30f1ab' 
  AND token = 'hvZeWyldLluqK1QqzeXI9eYCOBJ8Zwjl8xD4XR+U7oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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