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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f33d0f05e977fe6dd3e7d6d13ec2b109fa29d7fd3badf3a48e0c9f7024357ad' 
  AND token = 'Wy23Y60K6PgIUGOKIXtLdKthnrC0lVH+K98bbrnqQUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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