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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69cfd077ca20da821a289a353a18cc51e7218d578fd7b1ab68ea90d8fb765880' 
  AND token = 'XNSsKrC7L8Uir5savdccBXz4/AAMvXPWrtBjaISGQTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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