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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c7cb6fc44438cf85ae0aadfddfbdcff0fd6110e52e30b338963d071973221d' 
  AND token = 'o5tH6eOSb/LIXB45NkvdbtAbCVgCAjyZLcThr1er6R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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