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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1ff7b4f17d6d995740a0710ecf6b364eaed54a6c66ceb47556b4d778f93823' 
  AND token = 'vp3HbB7rgcubYPCG3AmzLmfMLPeLJf/9NcIEaepGRL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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