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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfd3c77c59a1b6e6ae32f42be5508e5b65aa87d3c9940c70b703dd81fc308e3' 
  AND token = '1ru0MklhWCOljDStdX8hV7S9nUUS77DPrQkFHSjWoYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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