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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab6c00109ee3124992ff51fa0a8e1b3196b119d9345902dec62e40d0dd4faa4' 
  AND token = 'aQ+hPJ7IHS6wKeW2anMOaRjHyQtGgH17X2NUDEH26D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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