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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ac117aa664660cee8d5829b483c0de16668cf47d61cc84607b040ce80904d2' 
  AND token = 'sbKXdxAq/mTPnkoHTyy1K7mORiaJ6IK8ne7fND59fT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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