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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da32a5afea3e99701459ec4acfb5f347906ab0b1c4a532e362d6d06fb327a79b' 
  AND token = '+PZpfXfAjYGgPv+v5Vry0raUQb2NAxq+xc+RELuCocI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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