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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd529c4a473e1007145b9e41f65cdcb695bb5679eee74ebdd8bef55c41627de7a' 
  AND token = '7ZLAtDO0d0ZzKNYq5HLybVtLG5K+q+WMZgnk32YRTu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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