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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767d644152071988eb8e0bf62164e71ab4a3d1aa7ac3a6c156d514b32a5afa34' 
  AND token = 'iiZJB58Lpt5YgGC0Mw6c15GtSZa7+cchK0puSMDx+D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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