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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4df0211082a3cfa64f465ab29a16372033c45a87f34a2787f2aa1125048eb0' 
  AND token = 'XFHvxVlxTWdpc2cf+BC5EHt6mr8CcWt0E89VBqNk4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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