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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8c2396b6d094faea362050e978bfd88ef126ce753ca97d5876d1530dcf03f4' 
  AND token = 'KA74xTw69cjL6h8Qy5BN48pF+Tni/lPK/rdlJXwkClY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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