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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713b4a2dab7b9d28883fe95527deae29bc870050d4d7dc1913900ef287724267' 
  AND token = 'kw3fheRHDe241Temo/NCW6E8gpcdyI+YuMqADbw1bE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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