SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db89c3d1bd6ee9122b8788c95cf963b9ba5d8717e7e3004ef614acba2e1abc7' 
  AND token = 'nWwqsAl29/u3U9fAMqJmwZmbCBLpRcdjBoFdG+KT2xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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