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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960ce52aef0d41c9a8e21212721107d7a9f7400c46a318d82e3c679bae8f3fe6' 
  AND token = '7nSlzAafpvSNmvl4nmv1hAjUtYaJbmJ/JSKa4UEs7ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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