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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fe886545357d6891640599a32623dd762a61655db283e5f9cbe2536d1ae605' 
  AND token = 'CCq1o0C5Z7Cd1w/ZwvkyQ2DqgLK6sCIls0KFmRbH5O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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