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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd94028a7c7c71f77eb2d5a7235fe3ec427ed6069b41c1a0eb0533e722c9311e' 
  AND token = '3q25TE0gxicMUIwOAO4A3FK7Y/7QiKt4ZwH8ozFCCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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