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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ed04a9239fbac9d72bf8f59aa03dae5180a934b4ce59de9bfe2ab3487cc94e' 
  AND token = 'LxTVeiteXPUS56uOnYua6X+wfDNQJKmRCyLLJ/gGc/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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