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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bc85342b87e6fe853f0f95cc735a20b5c0dd6ef97eb81f6fd4a1e7ca5f844e' 
  AND token = 'Dsvr3L6+Q84GxAQGzE8kcjY0SrhSrug4vrldQKthgAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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