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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fbc7119e545e9dcfbe9b6eb90aff722b7b048d9b9bfb0dd14211710a982a92' 
  AND token = 'KhoVtcFP1cuEvsQU6YV9YpV0OztGc0KgQFV4Zkfn430=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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