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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9292ee68e88d3bf5716d28904b7ba30f7a16503710c362098e5b846c7737443a' 
  AND token = '9yetJNkukepfxQd1c2yqRAh3fmWH99byPTJDXFhdXOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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