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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0485ad9a28882d78e6de2949a8985256c4a027cc4a9e05d7e72ef248cfe5a219' 
  AND token = '8ZpUPNJ+Kt5ksCIOtuXriG28lKzExml/Oj6mzpDCir0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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