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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3889a02a76e34fc48266f4f8ed0a62e3bad89c009fbbbcfd2de4645e7c14f9' 
  AND token = 'cdgbBOlwyFHeeQaZj86RRJoKjik63oVDO09vT/uMx6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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