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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca255ee761ba4c8721c0c4999fa80aeec63f59d68bcf6044ec90f28976d9aa5' 
  AND token = 'XUdcnIXzDvSuYnK1DQOEWR8/2nrcg6Dmv2+G5EVKIvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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