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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321e84f309a724ec68d64c4d68e921a6955d1a1ff75e8935ef57afc9595804ce' 
  AND token = 'Yid1A14YaMR4whlsQ1FnzViOTgR20QloHJSDaCI660Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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