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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4c18c4bccac470e8bfc8501453b6e18605960d1ec0723e8c71a15235c96ea5' 
  AND token = 'UzfutFTmSxHTj1K2TUs3jeNhiQH8u9G5iZlSBnBmHdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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