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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320dff2cfc59573057fd0e6ebb5fafde50a548dcb185daba387407b056ad2b89' 
  AND token = 'v+Dng7HQ55d8GFaGPuA46QCtVd6rHy/4nSyqew8sNQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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