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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1badaebbd2558a6f6738b8d05b3f019e0bb5d6ce736efd3a86e96d1f80e312fb' 
  AND token = 'sFf2WmGepWoDyspDSot/K+xyBCQF7TADSCBMUZEDDJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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