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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb74214ed38bdc3d2082a6b84348736f1ea876c9f4ae2fae6dd6057ca5c7f33' 
  AND token = 'on6mvVaTdentYhgEfgkpw9NYxPw1eW/dXXo3cG2L6Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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