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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb84d46877fde9428fac432965241548886e633ffcdef0be7a41f6dc7e63b350' 
  AND token = 'TZA4J5pJEEaPAtWEd0d+SxdqKIC2OtcIr/BNXzfbb34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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