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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3c33ef930e6160972c3da180afc647f27dfc465e30a1d6c82e6bf364998867' 
  AND token = 'RXzHXGxF/A/TDvHbP7r96BNWEkxUWrZyFcO+C0C1MWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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