SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ad3bbeb7d35ad84e692871f6cdffe2f285f1d695a471bda4167cb4d5374bc6' 
  AND token = 'gBde4+RLVvCOu5q6dh3OFEZnN6ldppGxiv6hO2SZJUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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