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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591c2dd4bdda5a5d1a127a61ae14fc3fba8b739e0eece7b7c2e4cca7701ed98d' 
  AND token = 'VRUMgrexzI9SfbCxja2zLp2iScNHu2iB/YcHliuVxp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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