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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1daafc3d1d947076a78e5c39e996a3844dd8014e9fb2744dc22ec1b6b6e6d6' 
  AND token = 'K/R2apnbDCGPqYnF270dAvPC3834pSSK53guE/68WV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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