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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9f2c28e0d4aedd8e90ff5f6c0ab10d3738dc1f8e35506f554f36f544c6067f' 
  AND token = 'W9I8KydP8bm9cBbXjMihd0MSzcrTCkBNYMzT5+84YxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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