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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bb55290af320a7780fa883f4c83730608d57360b7adb3fd02e8d5886da3bd1' 
  AND token = 'mv540+xQwm0PBJUBEPPYCoPhvUdPYm+9EV7DwliN1i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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