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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c558edfc9872293a4f191b82a0f9fd4534c300a1fbff9b54145bdbbbef87a1d6' 
  AND token = '72bo4yaUXL56y2qhw7z4fR82V+AIaAlJgmN1/FwFCgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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