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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db81bc2b996044b438cc90c6b1c6de22ed3d1f91ea7fcb6a1b6981a372961b00' 
  AND token = '5yFyVIsgCQSLxq2gjhr6nBle75iewbxc7UHTiFmaIWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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