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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed05433216a07d177b512ad0f096b76be305dc00e1456fb312af3260513bd3b' 
  AND token = 'BdEq9spCQoq38awF/zhnFC5auOrOX/ny12gGWmlgc9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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