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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03349c576c15cd54a2c1e87384835d16780909365a49e473a630ae12016c87a5' 
  AND token = 'XpHW+EFlAXwiWc9uXXf24zIDs7CV6Mxd/nqBf73Kjcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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